The nail ink started doing the rounds after a pop-up shop offering the tatts opened in New York.

Needle Nails, run by tattoo artists Ambie Stapleton and Christian Boyd, create freehand minimalist designs that can take anywhere from one to three hours to complete - depending on how many nails are being tattooed and how intricate the designs are.

Speaking to Insider, Christian said: "The process of tattooing the nail is pretty much the same as tattooing the skin.

"The only major difference would be the actual application. The nail surface is stiff and often rigid.